Expansion-bolt.



J. F. BOOR'AEM & G. E. ROHMER. EXPANSION BOLT. APPLICATION FILED NOV. 21, 1911.

1,120,368. Patented Dec. 8, 191;

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JOHN FRANCIS BOORAEM, or onnnnwicn, CONNECTICUT, AND GABRIEL a RO'HME'B,

or woonsmn, NEW YORK, assmnons TO THE BoonAEM & nomvmn PATENT coit- PANY, A oonronerron or new YORK nxrANsIon-nom.

Application filed November 27, 911. Serial No. 602,375.

To all whom it may concern:

Be it known that we, JOHN FRANCIS BOORAEM, a citizen of the United States of America, and residing in Greenwich, in the county of Fairfield and State of Connecticut, and GABRIEL E. ROHMER, a citizen of the United States of America, and residing'in W'oodside, in the county of Queens and State of New York, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a specification.

This invention relates to expansion bolts and has for its object to provide a new bolt which may be readily applied to structural uses.

An embodiment of the invention is shown in the drawings annexed, and will be described in detail hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 shows a side view with part broken away to show a section of our improved expansible member, Fig. 2 is a bottom view of the same showing the slot which enables the expansible member to expand and press against the walls of the hole to which the expansion bolt is applied, Fig. 3 is a. vertical, central section of the expanding member, Fig. 4 is a top view of the same, Fig. 5 shows a form with an interior screw-thread, Fig. 6 shows the expanding member and expansiblc mem ber applied to a bolt, Fig. 7 is a modified form of a bolt shown in Fig. 6 in which two expansible members are arranged back to back, in which one expanding member is screw-threaded and the other is not screwthreaded, Fig. 8 is a modified form of the bolt shown in Fig. 7, which shows a stud bolt, Fig. 9 is a modified form of expansible member showing the two back to back members in Figs. and 8, integral with each other, Fig. 10 is a modified form of the expansible member shown in Fig. 9, Fig. 11 is another modified form of expansible memher, and Fig. 12 shows the application of the bolt to the hole.

Similar letters of reference indicate con responding parts throughout the several figures of the drawings.

Referring to the drawings and more particularly to Fig. 12, the hole formed into concrete 1-5, the walls 16 of which are ongaged by the exterior part of the expansi-ble Specification 0! Lettr's Patent.

Patented Dec. 8, 1914.

member 17. The expansible member 1 7 is engaged at its interior by the expanding members 18, which are of substantially conical shape and engaged at either side of the cxpansible member, the smallest diameter of.

the expanding member being substantially equal to the largest diameter of the expansible member. By thecontinued penetration of the conical members, the cxpansible mem- One of the expanding members 18 and that farther from the nut 21 is intcrior'ly screwthreaded as shown in Fig. 6, and by the continued rotation of the nuts 21, the expanding member enters the expansible member.

The slot 19 is clearly shown in Fig. i

In the embodiment shown in Fig. 6, just one expanding member 18 and one cxpansi ble member 17 with one nut 21 and one bolt 20 are shown. By the rotation of the nut 21, the expanding member enters the expansible member 17 and thereby the expansible member is extended. lt'will be note that in the embodiments shown, the inner surface of the expansible member and the outer surface of the expanding member are,

inclined in the some direction to the bolt, the inclination of said outer surface of the expanding member being greater than the inclination of said inner surface of the expansible member.

In the embodiment shown in Fig. 7 the expansiblc members 17 and 17 are arranged back to back and have a conical interior which is adapted to be engaged by the expanding members L and 18" while the nut 21. is provided to operate the parts.

In Fig. 8, the bolt 20 is provided with a bolt head 31. while the jam-nut .22 holds the parts in position and enables the same to be tightened up when the parts are loosened by vibration.

In Fig. 9 the expansiblc members 17 and 17 shown in Figs. 7 and 8 are made in tegral with each other and form one expansible. member which has its exterior tapering so asto come to a peripheral meeting edge 24.

1n the embodiment shown in Fig. 10, the 5 exterior of the expansible member is cylindrical as shown at 23 instead of in the form as shown in Fig. 9. r

iembodiment shown'in Fig. 11, the again divided into two parts back ndare'arranged with a cylindrical bodiment shown in Fig. 12 the al slots is arranged V-shaped or mm the ends of the expansible o the meeting edges ofthe same, result -.'from the expansion of the yield-' able "expansible member.

The expansible member is made of a suitable elastic metal andlthe expanding memberisalso made of suitable steel or malleable iron. Thu expansible member retains its shape in substance'but is expanded by the interior radial pressure exerted by the entrance of the conical expanding member. A It will be noted that the male members in Fig. 12 enter the female or, expansible members very deeply, and have their approximate ends almost contiguous to each other. 7

We have shown several embodiments of our invention, but changes may be made therein without departing'from the spirit of the invention, as defined in the appended claims Having thus described our invention, we claim as newand desire to secure by Letters Patent:

1. In an expansion bolt, a bolt, an expansible ,member of springy material, an expanding member, the inner surface of said expansible member and the outer surface of said expanding member being inclined in the same direction to the bolt, the

inclination of said outer surface of the expan'ding member being greater than the inclination of said inner surface of the expansible member, the outer surface of said sible member of springymaterial, an expanding member, the inner surface of said expansible member and the outer surface of said expanding member being inclined in the same direction to the bolt, the inclination of said outer surface of the expanding member being greater than the inclination of said. inner surface of the expansible member.

3. In an expansion belt, a bolt, an expansible member of springy material, an expanding member, said expansible member having a longitudinal slot, the outer surface of said expanding member and the inner surface of said expansible member being inclined in the same direction. to the bolt, said out-er surface of the expanding member having a greater inclination than said inner surface of the expansible member, the longitudinal slot of. the expansible member extending through the length thereof.

In testimony, that we claim the foregoing as our invention, we have signed our names.

in presence of two subscribing Witnesses.

' J. FRANCIS BOOB-ABM.

GABRIEL E. ROHMER. Witnesses;

Joan Mormon, L. J. MURPHY. 

